Authentic prescription

A lady walks into a drug store, tells d pharmacist she needs some cyanide. He asks her why? "To poison my husband". "Lord hv mercy, i cant give u, its against d law. Dey'll throw us both in jail & i wil lose my licence". D lady den reaches into her purse, brings out d picture of her husband in bed wit d pharmacist's wife & hands it to him. He looks at d pix & replies, "U shuld hv told me u had a prescription